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Method and apparatus for predicting multi-section fracturing productivity of shale gas reservoir horizontal well

A technology for shale gas reservoir and productivity prediction, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as inability to predict shale gas productivity

Active Publication Date: 2015-11-11
PETROCHINA CO LTD
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Problems solved by technology

In the numerical simulation method, the finite element method, finite difference method, and boundary element method are mainly used for numerical simulation, which requires repeated division of the grid, and cannot accurately predict the production capacity of shale gas after multi-stage fracturing

Method used

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  • Method and apparatus for predicting multi-section fracturing productivity of shale gas reservoir horizontal well

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Embodiment Construction

[0047]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] The working principle of this technical solution is: when the extended finite element method is used to simulate crack propagation, it is not necessary to divide the grid repeatedly, which saves calculation costs. Accurate solutions are obtained on coarse grids.

[0049] Based on the above analysis, the present invention proposes a multi-stage fracturing productivity prediction method for horizontal wells in shale gas reservoirs, such as figure 1 shown....

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Abstract

The invention relates to a method and an apparatus for predicting multi-section fracturing productivity of a shale gas reservoir horizontal well. The prediction method comprises: obtaining shale gas reservoir original parameters after fracturing modification; establishing a physical model for a target region by utilizing the shale gas reservoir original parameters, and obtaining a strong form control equation of gas flow in a shale matrix and a strong form control equation of gas flow in a fracture network; establishing a control equation for the gas flow in the shale matrix and a comprehensive control equation for the flow in a fracture system by utilizing the strong form control equation of the gas flow in the shale matrix and the strong form control equation of the gas flow in the fracture network; establishing a strong discontinuous expansion function; substituting the strong discontinuous expansion function to the control equation for the gas flow in the shale matrix and the comprehensive control equation for the flow in the fracture system to calculate fracture pressure distribution; and substituting the fracture pressure distribution into a productivity equation to obtain shale gas productivity.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method and device for predicting productivity of multi-stage fracturing of horizontal wells in shale gas reservoirs. Background technique [0002] The total amount of shale gas in the world is about 456×10 12 m 3 , equivalent to the sum of reserves of coalbed methane and tight sandstone gas (two types of unconventional gas). The shale gas revolution in the United States has led to a significant increase in the amount of natural gas in the United States, and the world's energy pattern has also undergone significant changes. The development of shale gas has become a new focus of energy development in the world. [0003] Shale gas mainly exists in organic-rich shale and interlayers in the form of adsorbed gas and free gas. In shale gas reservoirs, the pore structure of the reservoir is complex, mainly consisting of micropores and nanopores. Horizontal we...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 李勇明江有适刘作磊
Owner PETROCHINA CO LTD
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